Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety is covered. The description adds that ZIP triggers live geo-distance sorting and returns live availability, which is useful. It does not disclose limitations such as capped result counts or network behavior beyond annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

A single front-loaded sentence that efficiently conveys purpose, modes, and returned fields. It is dense but not bloated, though the parenthetical is slightly awkward.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With annotations covering safety and a rich schema and output schema, the description is mostly adequate. It still lacks sibling differentiation and does not mention pagination or result limits, which are relevant for a locator tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so the schema already explains zip, take, and keyword in depth. The description restates the two lookup modes but adds no syntax or precedence detail beyond what the schema provides; baseline 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description names a specific verb (search), resource (physical CarMax store locations), and two supported lookup modes (ZIP, keyword). It also enumerates output fields (address, phone numbers, hours, live availability), making the tool's scope unambiguous.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

It implies two usage modes but does not state when to choose carmax_stores over the sibling carmax_store or carmax_search, nor when ZIP vs keyword is preferable beyond what the schema already says. No exclusions or alternatives are offered.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.